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y = a , r = 1
sehingga x = √r²-y²
= √1-a²
a. Cos 40 = x / r
= √1-a² / 1
= √1-a²
b. tan 50 = cotan (90-50)
= cotan 40
= cos 40 / sin 40
=
c. sin 140 = sin (180-140)
= sin 40
= a
d. cos 230 = - cos (230-180)
= - cos 50
= - sin (90-50)
= - sin 40
= - a